Across
- 4. An event in which the shadow of one celestial body falls on another.
- 6. The theory that all matter and energy in the universe was compressed into an extremely small volume that, 13 to 15 billion years ago exploded and began expanding in all directions.
- 8. The quantity of heat required to raise a unit mass of homogeneous material 1K or 1 degree C in a specified way, given constant pressure and volume.
- 10. The boundary between air masses of different densities and usually different temperatures.
- 12. The theory that explains how large pieces of the lithosphere move and change shape.
- 14. An apparent shift in the position of an object when viewed from different locations.
- 15. The solar radiation that reaches the Earth; also the rate of delivery of solar radiation per unit of horizontal surface.
- 16. A loop of relatively cool, incandescent gas that extends above the photosphere above the Sun’s edge as seen from Earth.
- 18. The degree of elongation of an elliptical orbit.
- 23. The emission of and propagation of energy in the form of electromagnetic waves, also moving subatomic particles.
- 25. Radiation detected from every direction in space almost uniformly; considered a remnant of the big bang.
- 27. The central part of the Earth below the mantle.
- 28. The distance that light travels in one year.
- 29. The path of a body as it moves around another body due to their mutual gravitational attraction.
- 30. The fraction of radiation that is reflected off the surface of an object.
Down
- 1. A dark area of photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field.
- 2. A large cloud of gas and dust in interstellar space; a region in space where stars form.
- 3. The process by which nuclei of small atoms combine to form a new, more massive nucleus; the process releases energy.
- 5. The ratio of the amount of water vapor in the air to the amount of water vapor needed to reach saturation at a given temperature.
- 7. A material or capacity, such as timber, a mineral deposit, or water power, that occurs in a natural state and has economic value.
- 9. The curving of the path of amoving object from an otherwise straight path due to Earth's rotation.
- 11. An occurrence, circumstance, or fact that is observable.
- 13. The weight of the air molecules.
- 17. The slow movement of matter in Earth’s mantle, which transfers energy as heat from the interior of Earth to the surface.
- 19. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle.
- 20. An elastic wave (or packet of energy) produced by an earthquake.
- 21. The part of Earth that has been constructed or modified by humans.
- 22. The process of bringing into or restoring to a suitable condition, such as a previous natural state.
- 24. The movement of matter due to differences in density; can result in the transfer of energy as heat.
- 26. A place where matter or energy is stored.